Are you a student, a developer, a designer, an entrepreneur or a member of a start-up, or simply a citizen concerned by climate change and with a desire to act ? Do you have ideas and solutions on how to reduce CO2 emissions in cities ? Then this is the challenge for you !

Your team must be made up of 1 to 6 participants at most. The team members should have varied profiles and different training backgrounds: business, engineering, IT, architecture, town planning, design, sociology schools or universities.

Importantly, these multicultural teams will be well-placed to generate the best ideas, since innovation very often results from the pooling of differing talents and visions.

If you have an idea but you do not have a team, please feel free to look for your team-mates directly on Decarbonathon platform or contact the organizers.

Download the following file, set out your ideas and your concept and introduce your team.



The challenge is a 4-step competition:

1st step: registration

You must submit a first deliverable to allow the members of the jury to select the most relevant ideas and solutions to reduce our carbon footprint in cities.

For this first stage we ask you to submit a file of a maximum of 5 slides in English.

Download the following file, set out your ideas and your concept and introduce your team.

Download the preselection document

This document must be completed and submitted before 22/11/2015 23:59 - Paris Time, GMT+1 - in your team space.

2nd step: mentoring

The teams selected from this first stage will take part in a unique online mentoring stage with the challenge’s partners.

They will be allocated expert coaches in their personal space to support and guide them in the development of their project for 3 weeks.

This is a unique approach for this Decarbonathon which will push your ideas to their maximum potential.

3rd step: the Hackathon

At the end of this mentoring stage, the selected teams will be invited to Paris on 14 and 15 January to meet their coaches and actually prototype their solution during a final stage in the form of a 48-hour physical hackathon.

At the end of the hackathon, the teams must submit online a final file containing an exhaustive presentation of their project. The details of this final submission will be explained to the teams invited to Paris for the third stage.

4th step: final presentation 

At the end of the hackathon, each team must present their project in the form of a pitch. This 10-minute presentation should reiterate the broad outlines of the project developed during the Decarbonathon and will be followed by 5 minutes of questions. You must be clear, concise, accurate and convincing!

Each presentation will be assessed by the members of the jury: 4 teams will be elected first-place winners of the challenge.

The winners' ranking will be determined following the oral presentation before the jury, made up of top management from the challenge's partners.

The winners of the competition and their projects will be displayed at Grand Palais (COP 21 central exhibition hall in Paris)

5th step : Start-up Acceleration Program 

The participating teams will have the privilege to join a unique Start-up Acceleration Program at the end of the challenge!

The partners of the Decarbonathon will provide them access to technology and training to help the participating teams grow their businesses and sustain that growth over time by partnering with local partners.

The Start-up Acceleration Program will last between 2 and 6 months and will cover part of the costs of practical application of R&D, technological assessment, acquisition of patents.

Selection criteria

Throughout the challenge, the files will be assessed based on the following criteria:

1) Impact and relevance of the proposal: your project must propose a clear response to reducing cities' COemissions and carbon footprint. (40%)

2) Implementation feasibility: your proposal must be deployable (cost, technology, resources, etc.) quickly (between 2 and 5 years) and on a large scale and be easily accessible to citizens and mayors so that they take them on board. (30%)

3) Originality of the proposal in terms of uses, technologies, economic model, process, etc. (20%)

4) Multiculturality of the team: your team is strongly encouraged to get together different people from different backgrounds or cultures. Create or join an international team that would be more likely to bring the best ideas! (10%)


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Waiting for selection
Teams of 1 to 6


  • 1Electric bikes
  • 2Eco-friendly trips
  • 3Parrot Zik 2.0 headphones
  • 4Smart Thermostats


  • Amali Abraham A.
  • Alexandre G.
  • maurya r.
  • Alice Michelle T.
  • Gheorghe C.
  • Guifre T.
  • Arthur P.
  • Mannan S.
  • André Luiz M.
  • Nicolas S.
  • David M.
  • Franklin Miguel N.
  • Nishit T.
  • wadzanai n.
  • Frédérick Z.

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